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140 lines
4.1 KiB
HTML
140 lines
4.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Draws an arc counterclockwise</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.ps-arc" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">ps_arc</h1>
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<p class="verinfo">(PECL ps >= 1.1.0)</p><p class="refpurpose"><span class="refname">ps_arc</span> — <span class="dc-title">Draws an arc counterclockwise</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.ps-arc-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>ps_arc</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$psdoc</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$x</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$y</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$radius</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$alpha</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$beta</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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Draws a portion of a circle with at middle point at
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(<code class="parameter">x</code>, <code class="parameter">y</code>). The arc starts at an
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angle of <code class="parameter">alpha</code> and ends at an angle of
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<code class="parameter">beta</code>. It is drawn counterclockwise (use
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<span class="function"><a href="ps_arcn.html" class="function">ps_arcn()</a></span> to draw clockwise). The subpath added
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to the current path starts on the arc at angle <code class="parameter">alpha</code>
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and ends on the arc at angle <code class="parameter">beta</code>.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.ps-arc-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">psdoc</code></dt>
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<dd>
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<p class="para">
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Resource identifier of the postscript file
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as returned by <span class="function"><a href="ps_new.html" class="function">ps_new()</a></span>.
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</p>
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</dd>
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<dt>
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<code class="parameter">x</code></dt>
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<dd>
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<p class="para">
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The x-coordinate of the circle's middle point.
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</p>
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</dd>
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<dt>
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<code class="parameter">y</code></dt>
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<dd>
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<p class="para">
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The y-coordinate of the circle's middle point.
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</p>
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</dd>
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<dt>
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<code class="parameter">radius</code></dt>
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<dd>
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<p class="para">
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The radius of the circle
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</p>
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</dd>
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<dt>
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<code class="parameter">alpha</code></dt>
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<dd>
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<p class="para">
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The start angle given in degrees.
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</p>
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</dd>
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<dt>
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<code class="parameter">beta</code></dt>
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<dd>
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<p class="para">
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The end angle given in degrees.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.ps-arc-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.ps-arc-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="ps_arcn.html" class="function" rel="rdfs-seeAlso">ps_arcn()</a> - Draws an arc clockwise</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |